姓名脱敏

public static String hideName(String realname) {

   if (realname == null) {

       return null;

   }

   char[] r = realname.toCharArray();

   String name = "";

   if (r.length == 1) {

       name = realname;

   }

   if (r.length == 2) {

       name = realname.replaceFirst(realname.substring(1), "*");

   }

   if (r.length > 2) {

       name = realname.replaceFirst(realname.substring(1, r.length - 1), "*");

   }

   return name;

}